Cognomen Laidler (Ladel 
, Laidler 
) , around the globe, is quite a rare family name. The last name Laidler is characteristic of the United Kingdom, where it is quite a rare surname, Australia, and New Zealand, where it is a rare surname. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Australia. Very seldom, Laidler is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ladel | United Kingdom, Morocco, United States, Canada, Philippines |
| Laidler | United Kingdom, Australia, United States, Germany, Canada |
| harry w. laidler American socialist, US (b. 1884) |
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| thomas percival laidler (1884-1958) socialist propagandist and bookshop manager (b. 1884) |
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| keith j. laidler British-born chemist, CA (b. 1916) |
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| konstanty laidler PL (b. 1909) |
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| fred laidler (b. 1918) |
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| david laidler Canadian economist, CA (b. 1938) |
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jeremy laidler Australian rules footballer (b. 1989) |
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| piotr laidler Polish biochemist and molecular biologist, PL (b. 1949) |
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| keith laidler (b. 1949) |
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| paweł laidler Polish political scientist (b. 1976) |
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| claire dinning laidler Peerage person ID=56593 |
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| robert laidler Peerage person ID=56592 |
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| jim laidler American anesthesiologist and alternative medicine opponent, US |
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| ian laidler British composer, educator and conductor, GB |
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| nicholas k laidler researcher |
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